I think you're on the right track Bob. I've got a couple of decades of experience with Easton products myself and from what I saw with these stakes it was a production and or QC issue. There was a tacky residue on the tubing after the heads came off that seemed to be "epoxy like" but was not set up. It gave me the impression of one part of a two part epoxy. My experience with Easton has been with their archery products, particularly aluminum and carbon arrow shafts. It's been my experience that with the proper component preparation (cleaning) and adhesive use, the components should be very difficult to separate under normal circumstances.
The design aspect of these two components is really pretty simplistic. My money is on a metal preparation or adhesive issue.
Scott



